from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework import status
from drf_yasg.utils import swagger_auto_schema
from django.shortcuts import get_object_or_404

from producers_products_variants.models.products_vairants import ProductsVariants
from producers_products_variants.serializers.products_variants_serializer import ProductsVariantsSerializer
from common.pagination.custom_pagination import CustomPageNumberPagination
from common.exceptions.exceptions import custom_exception_handler
from django.db.models import Sum
from rest_framework.permissions import IsAuthenticated

class ProductsVariantsPublicListAPIView(APIView):
    """Public endpoint to list all product variants for website users"""
    
    def get(self, request):
        categories = ProductsVariants.objects.all().select_related('product','products_color','product_type_and_size', 'created_by')
        
        product_det = self.request.query_params.get('product')
        if product_det:
            categories = categories.filter(product__id__iexact=product_det)

        total_quantity = categories.aggregate(total=Sum('quantity'))['total'] or 0

        paginator = CustomPageNumberPagination()
        paginated_queryset = paginator.paginate_queryset(categories, request)
        serializer = ProductsVariantsSerializer(paginated_queryset, many=True, context={'request': request})

        paginated_response = paginator.get_paginated_response(serializer.data)
        paginated_response.data['total_quantity'] = total_quantity

        return paginated_response

class ProductsVariantsListCreateAPIView(APIView):
    permission_classes = [IsAuthenticated]
    
    @swagger_auto_schema(request_body=ProductsVariantsSerializer)
    def post(self, request):
        serializer = ProductsVariantsSerializer(data=request.data, context={'request': request})
        serializer.is_valid(raise_exception=True)
        serializer.save(created_by=request.user)
        return Response({"Success": "Products variants created successfully"}, status=status.HTTP_201_CREATED)
    
    def get(self, request):
        categories = ProductsVariants.objects.all().select_related('product','products_color','product_type_and_size', 'created_by')
        
        user = request.user
        if user.role != 'admin':
            categories = categories.filter(created_by=user)
        
        product_det = self.request.query_params.get('product')
        if product_det:
            categories = categories.filter(product__id__iexact=product_det)

        total_quantity = categories.aggregate(total=Sum('quantity'))['total'] or 0

        paginator = CustomPageNumberPagination()
        paginated_queryset = paginator.paginate_queryset(categories, request)
        serializer = ProductsVariantsSerializer(paginated_queryset, many=True, context={'request': request})

        paginated_response = paginator.get_paginated_response(serializer.data)
        paginated_response.data['total_quantity'] = total_quantity

        return paginated_response

class ProductsVariantsDetailAPIView(APIView):
    @swagger_auto_schema(request_body=ProductsVariantsSerializer)
    def put(self, request, pk):
        category = get_object_or_404(ProductsVariants, pk=pk)
        serializer = ProductsVariantsSerializer(category, data=request.data)
        serializer.is_valid(raise_exception=True)
        serializer.save()
        return Response({"Success": "Products Variants updated successfully"}, status=status.HTTP_200_OK)
    
    def get(self, request, pk):
        category = get_object_or_404(ProductsVariants.objects.select_related('product','products_color','product_type_and_size'), pk=pk)
        serializer = ProductsVariantsSerializer(category)
        return Response(serializer.data)

    def delete(self, request, pk):
        category = get_object_or_404(ProductsVariants, pk=pk)
        category.delete()
        return Response({"success": "Products variants deleted successfully"}, status=status.HTTP_200_OK)